Dc Current Measurements; Ac Current (Frequency, Duty Cycle) Measurements - Extech Instruments EX503 User Manual

DC CURRENT MEASUREMENTS

CAUTION: Do not make 20A current measurements for longer than 30 seconds.
Exceeding 30 seconds may cause damage to the meter and/or the test leads.
1. Insert the black test lead banana plug into the negative COM jack.
2. For current measurements up to 4000µA DC, set the function switch to
the µA position and insert the red test lead banana plug into the
µA/mA jack.
3. For current measurements up to 400mA DC, set the function switch to
the mA position and insert the red test lead banana plug into the
µA/mA jack.
4. For current measurements up to 10A DC, set the function switch to the
10A position and insert the red test lead banana plug into the 10A jack.
5. Press the MODE button to indicate "DC" on the display.
6. Remove power from the circuit under test, then open up the circuit at
the point where you wish to measure current.
7. Touch the black test probe tip to the negative side of the circuit.
Touch the red test probe tip to the positive side of the circuit.
8. Apply power to the circuit.
9. Read the current in the display.

AC CURRENT (FREQUENCY, DUTY CYCLE) MEASUREMENTS

CAUTION: Do not make 20A current measurements for longer than 30 seconds.
Exceeding 30 seconds may cause damage to the meter and/or the test leads.
1. Insert the black test lead banana plug into the negative COM jack.
2. For current measurements up to 4000µA AC, set the function switch
to the µA position and insert the red test lead banana plug into the
µA/mA jack.
3. For current measurements up to 400mA AC, set the function switch to
the mA position and insert the red test lead banana plug into the
µA/mA jack.
4. For current measurements up to 10A AC, set the function switch to
the 10A position and insert the red test lead banana plug into the 10A
jack.
5. Press the MODE button to indicate "AC" on the display.
6. Remove power from the circuit under test, then open up the circuit at
the point where you wish to measure current.
7. Touch the black test probe tip to the neutral side of the circuit.
Touch the red test probe tip to the "hot" side of the circuit.
8. Apply power to the circuit.
9. Read the current in the display.
10. Press the Hz/% button to indicate "Hz".
11. Read the frequency in the display.
12. Press the Hz/% button again to indicate "%".
13. Read the % duty cycle in the display.
14. Press the Hz/% button to return to current measurement.
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